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89393-52-2

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89393-52-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 89393-52-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,3,9 and 3 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 89393-52:
(7*8)+(6*9)+(5*3)+(4*9)+(3*3)+(2*5)+(1*2)=182
182 % 10 = 2
So 89393-52-2 is a valid CAS Registry Number.

89393-52-2Relevant articles and documents

ASYMMETRIC SYNTHESIS OF β-SUBSTITUTED δ-KETOESTERS VIA MICHAEL-ADDITIONS OF SAMP/RAMP-HYDRAZONES TO α,β-UNSATURATED ESTERS, VIRTUALLY COMPLETE 1.6-ASYMMETRIC INDUCTION

Enders, Dieter,Papadopoulos, Kyriakos

, p. 4967 - 4970 (2007/10/02)

A simple and efficient 3-step asymmetric synthesis of β-substituted δ-ketoesters 3 in 45-62percent overall chemical yield and >=96-ca.100percent ee is described.The key step is an asymmetric Michael-addition of lithiated methylketone-SAMP- or RAMP-hydrazones to α,β-unsaturated esters 2 with virtually complete 1.6-asymmetric induction.

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